| RESPONSE OF THE ATMOSPHERIC GENERAL CIRCULATION TO WINTER SNOW COVER ANOMALY |
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| 作者姓名： | 陈海山 孙照渤 |
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| 作者单位： | Key Laboratory of Meteorological Disaster and Environmental Variation (KLME) Nanjing Institute of Meteorology，Nanjing 210044 |
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| 基金项目： | This work is supported by“National Key Program for Developing Basic Sciences-Research on the Formation Mechanism and Prediction Theory of Severe Climate Disasters in China”G1998040901-3. |
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| 摘 要： | In this paper,the response of the atmospheric general circulation to winter anomalous snowcover was investigated through observations studies and model simulation.Results from the observations show that:(1)the anomalous winter snow cover in theextratropics of Eurasian Continent bears an intimate relation to the contemporary atmosphericgeneral circulation.The positive anomaly of winter snow cover is usually accompanied by positiveatmospheric EUP teleconnection pattern and stronger East Asian winter monsoon:or vice versa.(2)The linkage between them suggests that the abnormal winter snow cover has an importantimpact on winter atmospheric general circulation.The anomalous snow cover pattern can lead tothe anomaly of winter atmospheric EUP teleconnection pattern and thus influence East AsianWinter monsoon.With NCAR CCM2 including BATS land surface scheme,three groups of experiments wereperformed to examine the atmospheric response to the anomalous snow cover pattern and explorethe relevant mechanism.Simulated results agree well with the observations,which testify thesignificant response of the atmosphere to snow cover anomaly.It is found that the radiative coolinginduced by anomalous snow cover plays an important role in above processes,and the feedback oflong-wave radiation can not be neglected.
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RESPONSE OF THE ATMOSPHERIC GENERAL CIRCULATION TO WINTER SNOW COVER ANOMALY |
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| CHEN Haishan SUN Zhaobo Key Laboratory of Meteorological Disaster and Environmental Variation.RESPONSE OF THE ATMOSPHERIC GENERAL CIRCULATION TO WINTER SNOW COVER ANOMALY[J].Acta Meteorologica Sinica,2002(2). |
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| Authors: | CHEN Haishan SUN Zhaobo Key Laboratory of Meteorological Disaster and Environmental Variation |
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| Abstract: | In this paper,the response of the atmospheric general circulation to winter anomalous snow cover was investigated through observations studies and model simulation. Results from the observations show that:(1)the anomalous winter snow cover in the extratropics of Eurasian Continent bears an intimate relation to the contemporary atmospheric general circulation.The positive anomaly of winter snow cover is usually accompanied by positive atmospheric EUP teleconnection pattern and stronger East Asian winter monsoon:or vice versa. (2)The linkage between them suggests that the abnormal winter snow cover has an important impact on winter atmospheric general circulation.The anomalous snow cover pattern can lead to the anomaly of winter atmospheric EUP teleconnection pattern and thus influence East Asian Winter monsoon. With NCAR CCM2 including BATS land surface scheme,three groups of experiments were performed to examine the atmospheric response to the anomalous snow cover pattern and explore the relevant mechanism.Simulated results agree well with the observations,which testify the significant response of the atmosphere to snow cover anomaly.It is found that the radiative cooling induced by anomalous snow cover plays an important role in above processes,and the feedback of long-wave radiation can not be neglected. |
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| Keywords: | anomalous snow cover pattern atmospheric EUP teleconnection pattern East Asian winter monsoon(EAWM) |
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